Abstract
A multilayer Bi-BTC/reduced graphene oxide (Bi-BTC/rGO) (BTC, 1,3,5-benzenetricarboxylic acid) film electrode was adopted to construct a highly sensitive Pb2+ electrochemical sensor. The multilayer Bi-BTC/rGO films were prepared via alternate cast of Bi-BTC and graphene oxide (GO) on a glassy carbon electrode, followed by electro-reduction of the GO components. Bi-BTC has porous broom-like structure and its organic ligand has abundant functional groups, which are favorable for Pb2+ adsorption and preconcentration. The introduction of rGO layer improves the conductivity of the MOFs material. Moreover, the multilayer composite structure greatly increased the exposure of active sites and the surface area of reactive contact, finally realizing the highly sensitive detection of Pb2+. Pb2+ was determined by differential pulse anodic stripping voltammetry and the response current was recorded at − 0.62 V. The [Bi-BTC/rGO]2 electrode provides a wide linear response ranging from 0.062 to 20.72 μg/L and a low limit of detection (LOD) of 0.021 μg/L (S/N = 3) for Pb2+, which is lower than the guideline value proposed by the World Health Organization. The method has been applied to determine Pb2+ in industrial wastewater with recoveries of 99.2–104% and RSDs of 3.4–4.0% (n = 3).
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Funding
We are grateful to the National Natural Science Foundation of China (21665010, 51862014, 31741103, and 51302117), the Natural Science Foundation of Jiangxi Province (20202ACBL213009, 20192BBEL50029), Jiangxi Outstanding Young Talents Funding Scheme (20162BCB23030), Provincial Projects for Postgraduate Innovation in Jiangxi (NDYC2020-S002), and the Natural Science Foundation of Nanchang City (No. 2018CXTD014) for their financial support of this work.
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Zou, J., Zhong, W., Gao, F. et al. Sensitive electrochemical platform for trace determination of Pb2+ based on multilayer Bi-MOFs/reduced graphene oxide films modified electrode. Microchim Acta 187, 603 (2020). https://doi.org/10.1007/s00604-020-04571-6
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DOI: https://doi.org/10.1007/s00604-020-04571-6